Manufacture of tubular rivets



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G W TUCKER Manufacture of T'lrbular-R.ivets., No. 228,423. Patented .lu ne I, 1880.

NJEFERS, FHOTO-UTHOGRAPMER, wAsmNGTON. D C.

UNITED STATES ATENT FFKQEO GEORGE WV. TUCKER, OF WATERBURY, CONNECTICUT.

MANUFACTURE OF TUBULAR RIVETS.

SlfECIFICATION forming part of Letters Patent No. 228,423, dated June 1 1880.

Application filed March 16, 1880.

Ta all whom it may concern:

Be it known that I, GEORGE W. TUCKER, of Waterbury, New Haven county, State of Connecticut, have invented an Improvement in the Manufacture of Tubular Rivets, of which the following is a specification.

My invention relates to the manufacture of tubular rivets and eyelets and like flanged articles from metal blanks bent and drawn to form a tube, partly solid and partly divided, the main object of the invention being to secure increased strength and rigidity in the ar' ticle.

In the drawings forming part of this specification, Figure l is aview showing one form of blank from which the rivet or eyelet'may be made; Figs. 2 and 3, views showing the eyelet at different stages of its manufacture; Fig. 4, a plan of Fig. 2; Figs. 5 and 6, views showing the manner of applying the cap to form the head, and Fig. 7 a modified form of blank.

The blank A may consist of a straight strip of metal widened toward and curved at the ends, as shown in Fig. 1, or of a piece having three, four, or more equidistant radiating arms, each distended and curved at the end, as in Fig. 7, it only being important to have the enlarged ends of such shape that they will, when curved, brought together, and bent outward, form a tube, a, with an inclined annular rim or flange, b. This result is secured by drawing the blank into a tube and then spreading the open end. These operations may be effected by means of a shouldered plunger or former and corresponding die, the end of the former forcing the blank into the die, as in making cartridges and other like articles, and the shoulder spreading the flange at the end of the tube.

After the article has been brought .to the shape shown in Fig. 2, a pointed tool is introduced and forced through the closed end, so

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as to open the latter, as shown in Fig. 3, thus producing an eyelet the tube of which is partly continuous and partly divided, but with the flange I) upon the divided end.

By thus making the eyelet with the flange upon the divided portion the latter isstrengthened, greater rigidity is imparted, and there is less tendency of the divisions to spread apart, while the opposite end, which must penetrate the material, being continuous, possesses consequently much greater strength.

The eyelet is headed to form a rivet by applying to the head a flanged cap, 0, as shown in Fig. 5, and bending up the flange of the cap under that of the eyelet and compressing the latter between its cap and its flange, as shown in Fig. 6, thereby forming a solid head of a most substantial character, and imparting as great strength and durability to the article as it would possess if made of one piece Without division or splitting.

I claim 1. The within-described im provementin manufacturing tubular rivets of metal, consisting in forming a blank with ends distended and rounded, as shown, and then drawing the body of the same by suitable formers into a tube and bending out the widened ends to form the flange, and then perforating and spreading the closed end, as specified.

2. A tubular rivet consisting of a partly-divided flanged tube having the flanges on the split end, and with a cap secured to the flanged end, and confining the sections thereof, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEO. W. TUCKER.

Witnesses W. H. COOKE, D. N. PLUME. 

